John: Boy, I really am bored.
Rob: I'm queasy after all this marker-huffing. Mind if i release my stomach onto you.
John: Only if you give me the airsick spaceman
A sex act wherein the female props herself on her hands, and the male holds her hips, and enters from behind, wheelbarrow-style. The bodies form a stylized capital A, hence the "Arizona," and the female's gravity-defying stance lends the "Spaceman."
A spacebang is a battle in space containing many explosions and all-around amazingness. There is absolutely no connection to the beautiful act of making love in space. None.